You can go to Church and be in a relationship that is not sanctioned by God, but every time there is an anointing, inside you feel the distance instead of the closeness of God.
Sharing physical intimacy outside of marriage is forbidden as recorded in the scriptures and there is a price to pay for disobeying God.
Just as with any sin, you are called to turn from your sinful ways and replace them with the ways of God.
The Bible says: 18. Flee fornication. Every sin that a man doeth is without the body; but he that committeth fornication sinneth against his own body.
19. What? know ye not that your body is the temple of the Holy Ghost which is in you, which ye have of God, and ye are not your own?
20. For ye are bought with a price: therefore glorify God in your body, and in your spirit, which are God's. Corinthians 6:18-20
Wouldn’t it be better to separate until you are married, so that when you are married you can have the blessing of God within the marriage?
Don’t expect to hear one word of this message from the world, because the world doesn’t care about you, your girl friend/boyfriend - the world doesn’t care about your future, nor does it care if you are in the will of God or out - but God does care and God knows what is best, not only for you but for your girl friend/boyfriend.
Separate for a season - Court one another and then marry. It is far less expensive (emotionally and financially) than any other option."
Note: I can just hear the mocking and the indifference from those who are living with someone and intend to continue, no matter what anyone says, even God. It's OK. You can stand firmly and adamantly against God on this issue and God will still love you the same. You will not enjoy the internal feeling you get from making things right with God nor will you get the benefits of waiting, planning, courting that you would if you chose differently, but don't ever believe anyone that says that God loves you less. It's just not true.
Excerpt from God thinking XCII - Questions Of The Heart by Keith C. Powell Copyright 2015